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Energy differences between frozen core and full core for B2PLYP/6-31G*

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For ()
  Energy (hartrees)
frozen core -581.0013444
correlated core -581.0078779
difference -0.0065334
  Energy (hartrees)
frozen core -581.0028654
correlated core -581.0094104
difference -0.0065449
  Energy (hartrees)
frozen core -580.9602398
correlated core -580.9668097
difference -0.0065699